| 摘要 |
PROBLEM TO BE SOLVED: To enable the rationalization of the mandrel for rolling up and rolling down the covering material for agricultural vinyl houses and enable the storage of the house, while it is stored. SOLUTION: The film which is spread out sideways for agriculture is fixed to the mandrel that is composed of a plurality of shaft units that are fixed to one edge or both edges of a fiber-reinforced synthetic resin pipe and is wound up or wound down by a winding up device jointed to one end of the mandrel. The pipe 12 as the main construction member for the mandrel is made of a fiber-reinforced synthetic resin 12a layer and the inner and the outer layers 12b, 12c made of a thermosetting resin where these 3 layers adhere thereto mutually. |
